Tear the crab sticks into bite-sized pieces.
Julienne the onion and cucumber.
Put the rice into a bowl.
Place the vegetables and crab sticks on top of the rice.
Mix mayonnaise, soy sauce, sesame oil, and black pepper to make the sauce.
Drizzle the sauce over the rice bowl.
Finish by sprinkling seaweed flakes and sesame seeds on top.